CN106464036B

CN106464036B - For sending method, wireless power transmitter and the wireless power receiver of signal by the wireless power transmitter in wireless charging system

Info

Publication number: CN106464036B
Application number: CN201580034480.6A
Authority: CN
Inventors: 李炅雨; 宋昑洙; 郑熙远
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2014-06-24
Filing date: 2015-06-24
Publication date: 2019-05-17
Anticipated expiration: 2035-06-24
Also published as: EP3161940A1; US10630112B2; KR102407895B1; US10944294B2; WO2015199442A1; US20210184506A1; US10075020B2; KR20160008103A; US11336124B2; EP3161940A4; CN106464036A; US20180366989A1; US20200251933A1; US20150372496A1; EP3161940B1; ES2912302T3

Abstract

A kind of wireless power transmitter by wireless charging system is provided to send the method, wireless power transmitter and wireless power receiver of signal.The method includes sending the first signal；Send second signal；The detection load variation during sending second signal；And extend the sending cycle of the second signal based on the load variation of detection.Wireless power transmitter includes: power transmission unit, is configured as sending the first signal and the second signal；Sensing unit is configured as the detection load variation during sending second signal；And controller, it is configured as extending the sending cycle of second signal based on the load variation of detection.

Description

For sending the side of signal by the wireless power transmitter in wireless charging system Method, wireless power transmitter and wireless power receiver

Technical field

The present invention relates to wireless chargings, and more particularly relate to send out by the wireless power in wireless charging system Method, the wireless power transmitter and the wireless power receiver of emitter transmission signal.

Background technique

In view of the property of mobile terminal, such as mobile terminal of Portable mobile phone and personal digital assistant (PDA) is by can be again It is rechargeable battery powered.In order to charge the battery, electric energy is supplied to battery by individual charger by mobile terminal.It is logical Often, charger and battery respectively have external contact terminal, and are therefore electrically connected each other by contacting their contact terminal It connects.

This charging scheme based on contact faces following problem: contact terminal be easy it is impaired and pollute external substance with And insecure battery charging is generated since contact terminal protrudes outward.In addition, if contact terminal is exposed under moisture, electricity Pond possibly can not suitably charge.

To solve the above-mentioned problems, wireless charging or contactless charging technology have been developed now and are applied to many Electronic equipment.

This wireless charging technology is sent and received based on wireless power.For example, once Portable mobile phone is not having It is placed on charging pad in the case where being connected to other charge connector, battery can automatic charging.In wireless charging product, Wireless electric toothbrush or wireless electric shaver are well known.Wireless charging technology provides following benefit: since electronics produces The waterproofness of the enhancing of the wireless charging of product and the portability due to no longer needing the enhancing of the wired charger of electronic equipment. In addition, it is expected that various relevant wireless charging technologies will be developed further in the upcoming electric car epoch.

It is primarily present three kinds of wireless charging schemes: using the electromagnetic induction scheme of coil, scheme and base based on resonance In radio frequency (the RF)/microwave radiation scheme for converting electric energy to microwave.

So far, the wireless charging scheme based on electromagnetic induction is most popular.However, it is contemplated that South Korea and The experiment being most recently successfully in wireless power transmission carried out at tens of meters of distance by microwave in other overseas countries, can It is anticipated that every kind of electronic product will carry out wireless charging in any place at any time in the near future.

Power based on electromagnetic induction sends the power transfer referred between primary coil and secondary coil.When magnet encloses When coiling is mobile, electric current is induced.Based on this principle, transmitter generates magnetic field and receiver passes through the variation by magnetic field And the electric current that induces generates energy.This phenomenon is known as magnetic induction, and the power based on magnetic induction is sent in energy biography It is very high to pass middle efficiency.

About the wireless charging based on resonance, system is proposed based on the power based on resonance for passing through coupled-mode theory Principle is sent to carry out wireless energy transfer from the charger at several meters of distance.Electromagnetic wave generates resonance with Portable belt electricity Can, rather than sound.Resonance electric energy is only directly transmitted in the presence of the equipment with identical resonance frequency, and not The electric energy used is reuptaked into electromagnetic field, rather than loss is in air.Therefore, compared with other electric waves, resonance electricity Machine or the mankind near capable of not interfering with.

Summary of the invention

Technical problem

Wireless power transmitter (or power transmission unit (PTU)) detects or determines wireless power receiver, and (or power connects Receive unit (PRU)) method that whether is placed in the wireless power transmitter may include that detection is included in wireless power transmitter In power transmission unit impedance variation method.

If wireless power transmitter (PTU) detects the presence of wireless power receiver by impedance variations detection etc. (PRU), then the wireless power transmitter can start to communicate with wireless power receiver by supply power, wireless power Receiver can execute communication using the power.

For example, according to the wireless charging standard of wireless charging alliance (A4WP), long beacon is can be transmitted in wireless power transmitter Signal, and when receiving long beacon signal, wireless power receiver can be in the given time by notice (advertisement) signal is sent to wireless power transmitter, to continue the registration (registration) of wireless charging Process.

However, needing the power of battery of the start-up course concurrent wireless power receiver for operation processing device lower or Exhaust or wireless power receiver power off in the case where, wireless power receiver will not in the given time send out right of way signal It send to wireless power transmitter.If wireless power receiver can not send right of way signal in this way in the given time, Normal registration process is so not carried out, therefore wireless charging cannot be carried out to wireless power receiver.

Solution to the problem

The present invention is at least able to solve the above problem and/or disadvantage, and is at least capable of providing advantages described below.

Therefore, it is an aspect of the present invention to provide the signaling methods and offer wireless power in wireless charging system Transmitter and wireless power receiver, in the method if wireless power transmitter is in the transmission for terminating its long beacon signal Load variation is detected before, then the wireless power transmitter can extend the sending cycle of long beacon signal, it is logical to receive Accuse signal.

Another aspect of the present invention is to provide the signaling method in wireless charging system and provides wireless power hair Emitter and wireless power receiver, in the method if wireless power transmitter terminate its long beacon signal transmission it Before receive beacon and extend request signal, then the wireless power transmitter can extend the sending cycle of long beacon signal, with Just right of way signal is received.

According to an aspect of the present invention, it provides through the wireless power transmitter in wireless charging system and sends signal Method.The method includes sending the first signal；Send second signal；The detection load variation during sending second signal； And extend the sending cycle of second signal based on load variation detected.

According to another aspect of the present invention, wireless power transmitter is provided.The wireless power transmitter includes: power Transmission unit is configured as sending the first signal and the second signal；Sensing unit is configured as examining during sending second signal Survey load variation；And controller, it is configured as extending the sending cycle of second signal based on load variation detected.

According to another aspect of the present invention, wireless power receiver is provided.The wireless power receiver includes: power Receiving unit is configured as receiving the first signal and the second signal；Control circuit is electrically connected to power receiving unit and is matched It is set to based on the control signal generated by received first signal of power receiving unit or second signal for loading variation；With And switch unit, it is arranged between power receiving unit and load, and be configured as based on the control from control circuit Signal carrys out the connection between power switched receiving unit and load.

Advantageous effect of the invention

It will become apparent from as basis is described above, an embodiment according to the present invention, or even in wireless power The case where power of battery of receiver is lower or exhausts or need processor of the start-up course to operate wireless power receiver Under, wireless power transmitter can receive in the given time right of way signal by detection load variation.

In addition, an embodiment according to the present invention, or even the power of battery of wireless power receiver is lower or consumption To the greatest extent or in the case where needing processor of the start-up course to operate wireless power receiver, wireless power transmitter can by from Wireless power receiver receives prearranged signals to receive right of way signal in the given time.

Detailed description of the invention

The explanation carried out and below in conjunction with attached drawing will more clearly understand above and other aspect of the invention, spy Sign and advantage, in the accompanying drawings:

Fig. 1 is the block diagram of the integrated operation of wireless charging system；

Fig. 2 is the wireless power transmitter of an embodiment according to the present invention and the block diagram of wireless power receiver；

Fig. 3 is the wireless power transmitter of an embodiment according to the present invention and the block diagram of wireless power receiver；

Fig. 4 is the behaviour for wireless power transmitter and wireless power receiver of an embodiment according to the present invention The flow chart of the signal stream of work；

Fig. 5 is the wireless power transmitter of an embodiment according to the present invention and the method for wireless power receiver Flow chart；

Fig. 6 be show an embodiment according to the present invention by wireless power transmitter apply power amount it is opposite In the figure of time shaft；

Fig. 7 is the flow chart of the method for the control wireless power transmitter of an embodiment according to the present invention；

Fig. 8 is to show the amount for the power of the flow chart according to Fig. 7 applied by wireless power transmitter relative to time shaft Figure；

Fig. 9 is the flow chart of the method for the control wireless power transmitter of an embodiment according to the present invention；

Figure 10 is to show the amount of the power by wireless power transmitter supply of the flow chart according to Fig. 9 relative to time shaft Figure；

Figure 11 be an embodiment according to the present invention wireless power transmitter under single machine (SA) mode and The block diagram of wireless power receiver；

Figure 12 is the figure for showing the transmission of beacon signal of an embodiment according to the present invention；

Figure 13 is the figure for showing the transmission of beacon signal of an embodiment according to the present invention；

Figure 14 is the flow chart for showing the beacon signal transmission process of an embodiment according to the present invention；

Figure 15 is the figure for showing the transmission of beacon signal of an embodiment according to the present invention；

Figure 16 is the flow chart for showing the beacon signal transmission process of an embodiment according to the present invention；And

Figure 17 is the block diagram of the wireless power receiver of an embodiment according to the present invention.

Specific embodiment

It provides and helps comprehensive understanding such as the equivalent institute by appended claims and they referring to being described below for attached drawing The present invention of restriction.Throughout the drawings, identical appended drawing reference will be appreciated that refer to identical part, component and structure.Its It helps to understand including various details, but these will be regarded as merely illustrative.Therefore, those of ordinary skill in the art The each of the embodiment that can make invention as described herein without departing from the scope and spirit of the present invention will be recognized Kind changes and modification.In addition, the description to well-known function and construction can be omitted in order to clear and brief.

The dictionary meanings for being not limited to them with term used in claim and vocabulary are described below, are only used for energy It is enough clear of the invention with consistently understanding.Therefore, it will be apparent for a person skilled in the art that providing embodiment party of the invention Being described below for case is only for purposes of illustration, rather than in order to limit such as the equivalent institute by appended claims and they The present invention of restriction.

It should be understood that unless context clearly dictates otherwise, otherwise singular " one (a) ", " one (an) " and " institute State " it include multiple indicants.Thus, for example mentioning " parts surface " includes mentioning one or more this kind of surfaces.

Term " substantially " instruction is not interfering the spy without accurately attaining cited characteristic, parameter or value Property the amount of effect that is intended to provide in, deviation or variation, including such as tolerance, measurement error, accuracy of measurement limit can occur System and other factors known to those skilled in the art.

Description will provide the general of the wireless charging system for being suitable for embodiment of the present invention referring to figs. 1 to Figure 11 first It reads, will be described in the method for sending signal by the wireless power transmitter in wireless charging system later, and It will be described in the wireless power transmitter and wireless power according to 2 to Figure 17 various embodiments of the present invention referring to Fig.1 Receiver.

Fig. 1 is the block diagram of the integrated operation of wireless charging system.

Referring to Fig.1, wireless charging system includes wireless power transmitter (or power transmission unit (PTU)) 100 and one Or multiple wireless power receiver (or power receiving unit (PRU)) 110-1,110-2 ... and 110-n.

Wireless power transmitter 100 can respectively by power 1-1,1-2 ... and 1-n is wirelessly transmitted to wireless power and connects Receipts device 110-1,110-2 ... and 110-n.In addition, wireless power transmitter 100 can only by power 1-1,1-2 ..., The wireless power receiver authenticated during predetermined authentication is wirelessly transmitted to 1-n.

Wireless power transmitter 100 can establish wireless power receiver 110-1,110-2 ... and 110-n is electrically connected It connects.For example, wireless power transmitter 100 can by electromagnetic wave wireless power be sent to wireless power receiver 110-1, 110-2 ... and 110-n.

Wireless power transmitter 100 can carry out with wireless power receiver 110-1,110-2 ... and 110-n's is two-way Communication.Wireless power transmitter 100 and wireless power receiver 110-1,110-2 ... and 110-n can be handled or be sent/connect Receive the data packet 2-1,2-2 configured with predetermined frame ... and 2-n.The frame is hereinafter explained in more detail.Nothing Linear heat generation rate receiver can be configured to mobile communication terminal, personal digital assistant (PDA), personal multimedia player (PMP), intelligence Energy mobile phone etc..

Power can be wirelessly applied to multiple wireless power receiver 110-1,110- by wireless power transmitter 100 ... and 110-n 2,.For example, power can be sent to multiple wireless power receivers by resonance by wireless power transmitter 100 110-1,110-2 ... and 110-n.If wireless power transmitter 100 uses resonance scheme, wireless power transmitter 100 and wireless power receiver 110-1,110-2 ... the distance between 110-n may preferably be 30m or smaller.If Wireless power transmitter 100 uses electromagnetic induction scheme, then wireless power transmitter 100 and wireless power receiver 110-1, 110-2 ... the distance between 110-n may preferably be 10cm or smaller.

Wireless power receiver 110-1,110-2 ... and 110-n can receive wireless function from wireless power transmitter 100 Rate, and charge to its internal cell.In addition, wireless power receiver 110-1,110-2 ... and 110-n can be respective Information, wireless power receiver status information or nothing needed for the signal for requesting wireless power to send, wireless power are received The control information of linear heat generation rate transmitter 100 is sent to wireless power transmitter 100.The information of signal about transmission is hereinafter It is explained in more detail.

Wireless power receiver 110-1,110-2 ... and each of 110-n can will also indicate its charged state Message be sent to wireless power transmitter 100.

Wireless power transmitter 100 may include the display device of such as display, and can be based on receiving from wireless power Device 110-1,110-2 ... and the received message of 110-n come show wireless power receiver 110-1,110-2 ... and The state of each of 110-n.In addition, wireless power transmitter 100 can show until wireless power receiver 110-1, 110-2 ... and each of 110-n fully charged desired time.

The control signal for being used to disable wireless charging function can be sent to wireless power reception by wireless power transmitter 100 Device 110-1,110-2 ... and 110-n.It receives when from wireless power transmitter 100 for disabling wireless charging function When controlling signal, wireless power receiver can disable wireless charging function.

Fig. 2 is the wireless power transmitter of an embodiment according to the present invention and the block diagram of wireless power receiver.

Referring to Fig. 2, wireless power transmitter 200 may include power transmission unit 211, controller 212, communication unit 213, At least one of display unit 214 and storage unit 215.

Power needed for power transmission unit 211 can supply wireless power transmitter 200, and can be by power wirelessly provisioning To wireless power receiver 250.Power transmission unit 211 can supply the power of the form of submission galvanic electricity (AC) waveform, Huo Zhetong Crossing by means of converter will be in that the power of direct current (DC) waveform is converted into the power in AC waveform.Power transmission unit 211 can It is embodied as internal battery.Alternatively, power transmission unit 211 can be realized as power receiving interface, to receive function in outside Rate and by power supply to other component.It will be apparent to one skilled in the art that as long as it is capable of supply that the function in AC waveform Rate, any device can be employed as power transmission unit 211.

Controller 212 can provide the overall control to wireless power transmitter 200.Control operation can be used in controller 212 Algorithm that required slave storage unit 215 is read, program or application program control total gymnastics of wireless power transmitter 200 Make.Controller 212 can be realized as central processing unit (CPU), microprocessor or minicomputer.

Communication unit 213 can to communicate with wireless power receiver 250 with scheduled communication plan.Communication unit 213 Power information can be received from wireless power receiver 250.Power information may include the letter about at least one of the following Breath: capacity, surplus battery quantity, charging times, usage amount, battery capacity and the battery ratio of wireless power receiver 250.

In addition, the charge function control of the charge function for controlling wireless power receiver 250 can be transmitted in communication unit 213 Signal processed.Charge function control signal can be to be opened by controlling the power receiving unit 251 of specific wireless power receiver 250 With or disabling charge function control signal.In addition, As described in detail below, power information may include about inserted with line charge Electric terminal, from single machine (SA) Mode change at non-single machine (NSA) mode, error condition discharge etc. information.

In addition, an embodiment according to the present invention, it may include related with power control that charge function, which controls signal, Information or the power control command that the exception of generation is coped with.

Communication unit 213 can receive signal from another wireless power transmitter and wireless power receiver 250.Example Such as, communication unit 213 can be continued by receiving the right of way signal sent from the communication unit 253 of wireless power receiver 250 Carry out the registration process of wireless charging.

Controller 212 can show list from the received message of wireless power receiver 250 based on by communication unit 213 The state of wireless power receiver 250 is shown in member 214.In addition, controller 212 can be shown on display unit 214 until nothing The fully charged desired time of linear heat generation rate receiver 250.

As shown in Fig. 2, wireless power receiver 250 may include power receiving unit 251, controller 252, communication unit 253, at least one of display unit 258 and storage unit 259.

Power receiving unit 251 can wirelessly receive power from wireless power transmitter 200.Power receiving unit 251 can The power in the form of AC waveform is received from wireless power transmitter 200.

Controller 252 can provide the overall control to wireless power receiver 250.Control operation can be used in controller 252 Algorithm that required slave storage unit 259 is read, program or application program control total gymnastics of wireless power receiver 250 Make.Controller 252 can be realized as CPU, microprocessor or minicomputer.

Communication unit 253 can to communicate with wireless power transmitter 200 with scheduled communication plan.Communication unit 253 Power information can be sent to wireless power transmitter 200.Power information may include about at least one of the following Information: capacity, surplus battery quantity, charging times, usage amount, battery capacity and the battery ratio of wireless power receiver 250.

In addition, communication unit 253 can receive the charge function control of the charge function for controlling wireless power receiver 250 Signal processed.Charge function control signal can be the power receiving unit 251 by controlling wireless power receiver 250 to enable Or the control signal of disabling charge function.Alternatively, As described in detail below, power information may include about wired charging The insertion of terminal, from SA Mode change at NSA mode, error condition discharge etc. information.In addition, a reality according to the present invention Scheme is applied, charge function controls the function that signal may include information related with power control or be coped with to the exception of generation Rate control command.

It is sent out in addition, communication unit 253 can be received by power receiving unit 251 from the power of wireless power transmitter 200 The beacon signal for sending unit 211 to send, and right of way signal is sent to wireless power transmitter 200 in the given time, from And continue the registration process of wireless charging.

Controller 252 can show the state of wireless power receiver 250 on display unit 258.In addition, controller 252 It can be shown on display unit 258 until the fully charged desired time of wireless power receiver 250.

Fig. 3 is the wireless power transmitter of an embodiment according to the present invention and the detailed frame of wireless power receiver Figure.

Referring to Fig. 3, wireless power transmitter 200 may include at least one of the following: send (Tx) resonator 211a, controller 212 (for example, micro-control unit (MCU)), communication unit 213 (for example, out-of-band signalling unit), matching unit 216, driver (for example, power supply unit) 217, power amplifier (PA) 218 and sensing unit 219.Wireless power receiver 250 may include at least one of the following: receive (Rx) resonator 251a, controller 252, control circuit 252a, communication Unit 253, rectifier 254, DC/DC converter 255, switch unit 256 and load unit (or client device load) 257.

The exportable DC power with scheduled voltage of driver 217.The voltage value of the DC power exported from driver 217 It can be controlled by controller 212.

The DC electric current exported from driver 217 can be applied to PA 218.PA 218 can be electric to amplify DC with predetermined gain Stream.In addition, DC power can be converted into AC power based on from 212 received signal of controller by PA 218.Therefore, PA 218 can Export AC power.

Impedance matching can be performed in matching unit 216.It is observed for example, matching unit 216 is controllable from matching unit 216 Impedance, so that its output power can have high efficiency or high power.Sensing unit 219 can pass through Tx resonator 211a or PA 218 sensings are changed by the load that wireless power receiver 250 generates, and sensing result can be supplied to controller 212.

An embodiment according to the present invention, when wireless power transmitter 200 is by short beacon signal or long beacon signal When being sent to wireless power receiver 250, which can be loaded by means of generations such as predetermining circuits changes. The sensing unit 219 of wireless power transmitter 200 can detect the load variation of wireless power receiver 250, and load is become Change testing result and is supplied to controller 212.An embodiment according to the present invention, based on what is detected by sensing unit 219 Load variation, controller 212 can detect the presence of wireless power receiver 250 or can extend or adjust beacon signal (for example, Long beacon signal) sending cycle.

Matching unit 216 can adjust impedance under the control of controller 212.Matching unit 216 may include coil and capacitor At least one of device.Controller 212 can control the connection of at least one of coil and capacitor, and therefore can be corresponding Ground executes impedance matching.

Input AC power can be sent to Rx resonator 251a by Tx resonator 211a.Tx resonator 211a and Rx resonator 251a can realize as the resonance circuit with identical resonance frequency.For example, resonance frequency can be identified as 6.78MHz.

Communication unit 213 (Wireless Fidelity (WiFi), ZigBee or bluetooth (BT)/low-power consumption bluetooth (BLE) can be passed through) with The traffic element 253 of wireless power receiver 250 is for example bidirectionally communicated with the frequency of 2.4GHz.

Rx resonator 251a can receive the power for charging.In addition, Rx resonator 251a, which can receive, passes through wireless power The beacon signal (for example, short beacon signal or long beacon signal) that the Tx resonator 211a of transmitter 200 is sent.

Rectifier 254 can will be rectified into DC power from the received wireless power of Rx resonator 251a.For example, rectifier 254 It can be realized in the form of diode bridge.DC/DC converter 255 can be converted rectified power with predetermined gain. For example, DC/DC converter 255 can convert rectified power, so that the voltage of its output can be 5V.It can be applied to The minimum amount of voltage that and maximum voltage value of the input of DC/DC converter 255 can be preset.

DC/DC converter 255 can be connected to load unit 257 by switch unit 256.Switch unit 256 is in controller 252 Control under be positively retained at out (ON) or close (OFF) state.Switch unit 256 is optional.If switch unit 256 is in and opens State, then load unit 257 can be stored from the received conversion power of DC/DC converter 255.

An embodiment according to the present invention, control circuit 252a can be based on the Rx for passing through wireless power receiver 250 Resonator 251a received signal generates the control signal for controlling switch unit 256.For example, control circuit 252a is (no It is same as controller 252) by 250 received signal of wireless power receiver (for example, short beacon signal or long beacon signal) Driving, such control circuit 252a can generate load variation by control switch unit 256.An implementation according to the present invention Scheme can produce the load variation of wireless power receiver 250, even if not having when providing control circuit 252a as described above It is also such that power is disabled supplied to controller 252 or controller 252.

In addition, an embodiment according to the present invention, control circuit 252a can be based on passing through wireless power receiver 250 Rx resonator 251a received signal (for example, short beacon signal or long beacon signal) Lai Shengcheng preassigned pattern code or letter Number.Load switch (for example, switch unit 256) can be controlled by the code that generates in control circuit 252a or signal, so as to Generate the load variation for corresponding to predetermined code or signal.Wireless power transmitter 200 can detect wireless power receiver 250 Load variation, and predetermined code or signal are decoded, to obtain predetermined information (for example, with the beacon signal period Extend related information).

Fig. 4 is the behaviour for wireless power transmitter and wireless power receiver of an embodiment according to the present invention The flow chart of the signal stream of work.

Referring to Fig. 4, in step S401, wireless power transmitter 400 can power on.When powering on, in step In S402, wireless power transmitter 400 can configure environment.

In step S403, wireless power transmitter 400 can enter energy-saving mode.In energy-saving mode, wireless power hair Emitter 400 can be using the different types of power beacon with its respective period with for detecting, this joins in further detail below It is described according to Fig. 6.For example, wireless power transmitter 400 can be transmitted power beacon S404 and S405 (for example, short beacon or Long beacon) to be used to detect, and power beacon S404 and S405 can have different performance numbers.Power beacon for detection One or both of S404 and S405 can have enough power to drive the communication unit of wireless power receiver 450.Example Such as, by means of one or both of the power beacon S404 and S405 for detection, wireless power receiver 450 can pass through drive It moves the communication unit of wireless power transmitter 400 and is communicated with the wireless power transmitter 400.This state can be described as sky shape State.

When wireless power receiver 450 to be placed in wireless power transmitter 400, wireless power transmitter 400 can Detection load variation.In step S408, wireless power transmitter 400 can enter low-power mode.It is more detailed below with reference to Fig. 6 Ground describes low-power mode.In step S409, wireless power receiver 450 can be based on receiving from wireless power transmitter 400 Power drive the communication unit of the wireless power receiver 450.

In step S410, PTU can be searched for signal and be sent to wireless power transmitter 400 by wireless power receiver 450. PTU can be searched for signal as based on notice (AD) signal of BLE and sent by wireless power receiver 450.Wireless power receives Device 450 can periodically send PTU search signal, until it receives response signal or warp from wireless power transmitter 400 Until crossing predetermined amount of time.

In step S411, when receiving PTU search signal from wireless power receiver 450, wireless power transmitter 400 transmittable PRU response signals.PRU response signal can establish wireless power transmitter 400 and wireless power receiver 450 it Between connection.

In step S412, PRU stationary singnal is can be transmitted in wireless power receiver 450.PRU stationary singnal can indicate wirelessly The state of power receiver 450, and can request to access the wireless power network managed by wireless power transmitter 400.

In step S413, PTU stationary singnal is can be transmitted in wireless power transmitter 400.It is sent out by wireless power transmitter 400 The PTU stationary singnal sent can indicate the ability of wireless power transmitter 400.

In step S414 and S415, sent and received in wireless power transmitter 400 and wireless power receiver 450 After PRU stationary singnal and PTU stationary singnal, wireless power receiver 450 can periodically send PRU Dynamic Signal.PRU is dynamic State signal may include at least one parameter measured by wireless power receiver 450.For example, PRU Dynamic Signal may include about In the information of the voltage of the output of the rectifier of wireless power receiver 450.In step S 407, wireless power receiver 450 state can be described as starting state.

In step S416,400 ingoing power transfer mode of wireless power transmitter.In step S417, wireless power Transmitter 400 PRU for being used to enable charging can be controlled signal or command signal is sent to wireless power receiver 450.In function In rate transfer mode, charge power is can be transmitted in wireless power transmitter 400.

The PRU control signal sent by wireless power transmitter 400 may include enabled/disabled wireless power receiver 450 Charging information and authority information.Each charged state transmittable PRU control signal when changing.For example, can every 250ms or PRU is sent when Parameters variation occurs controls signal.PRU control signal can be configured to send in scheduled threshold time, Such as in 1 second, even if it is also such for changing without parameter.

In step S418 and S419, wireless power receiver 450 can control signal according to PRU to change setting, and PRU Dynamic Signal is sent to report the state of wireless power receiver 450.The PRU dynamic sent by wireless power receiver 450 Signal may include the information about at least one of voltage, electric current, wireless power receiver state and temperature.Wireless power connects The state for receiving device 450 can be described as open state.

PRU Dynamic Signal can have following data structure shown in following table 1.

Table 1

[table 1]

Referring to the above table 1, PRU Dynamic Signal may include one or more fields.Field can provide optional field information, The information of the voltage of output about the rectifier in wireless power receiver 450, about in wireless power receiver 450 Rectifier output electric current information, about the output of the DC/DC converter in wireless power receiver 450 Voltage information, about the DC/DC converter in wireless power receiver 450 output electric current information, temperature Information, about the rectifier in wireless power receiver 450 output minimum amount of voltage that V_{RECT_MIN_DYN}Information, close In the optimum voltage value V of the output of the rectifier in wireless power receiver 450_{RECT_SET_DYN}Information, about wireless The maximum voltage value V of the output of the rectifier of power receiver 450_{RECT_HIGH_DYN}Information and warning message (for example, PRU alarm).PRU Dynamic Signal may include at least one of above-mentioned field.

For example, according to charging situation (for example, output about the rectifier in wireless power receiver 450 Minimum amount of voltage that V_{RECT_MIN_DYN}Information, about the rectifier in wireless power receiver 450 output optimum voltage Value V_{RECT_SET_DYN}Information and the output about the rectifier in wireless power receiver 450 maximum voltage value V_{RECT_HIGH_DYN}Information) determine at least one voltage setting value can be carried out at least one field of PRU Dynamic Signal It sends.When receiving PRU Dynamic Signal, wireless power transmitter 400 can based on the voltage value set in PRU Dynamic Signal come Adjustment is sent to the wireless charging voltage of each wireless power receiver 450.

In field, configured in the data structure that PRU alarm can be shown in Table 2 below.

Table 2

[table 2]

Referring to the above table 2, PRU alarm may include for restarting the position of request, for the position of transformation and for trip The position of row adapter (TA) detection.TA check bit instruction wireless power receiver 450, which is already connected to, provides the wireless of wireless charging Wired charging terminal in power transmitter 400.Transition bit informs wireless power transmitter 400: wireless power receiver 450 exists The communication integrated circuit (IC) of wireless power receiver 450 is from SA Mode change at being reset before NSA mode.Finally, Power is sent by reduction and has stopped the wireless power transmitter 400 of charging back to just when due to overcurrent or overtemperature When normal state, restarting request position instruction wireless power transmitter 400 is ready to restore filling for wireless power receiver 450 Electricity.

It is configured in the data structure that PRU alarm can also be shown in Table 3 below.

Table 3

[table 3]

Referring to the above table 3, PRU alarm may include overvoltage, overcurrent, overtemperature, PRU self-protection, charging complete, The field of wired charger detection and Mode change.If overvoltage field is configured to " 1 ", this can imply that wireless power receives The voltage Vrect of device 450 has been more than overvoltage limit.Overcurrent and overtemperature field can be with identical with overvoltage field Mode is set.PRU self-protection indicates that wireless power receiver 450 is protected by directly reducing the power in entire load Protect itself.In this case, wireless power transmitter 400 haves no need to change charged state.

An embodiment according to the present invention, the position for Mode change can be configured to such value, which is used for Notify the duration of 400 Mode change of wireless power transmitter.Mode change position can be matched shown in table 4 as follows It sets.

Table 4

[table 4]

Referring to the above table 4, if Mode change position is configured to " 00 ", this can indicate no Mode change.If mode Transition bit is configured to " 01 ", this can indicate for complete Mode change when be limited to 2 seconds.If Mode change position is configured to " 10 ", this can indicate for complete Mode change when be limited to 3 seconds.If Mode change position is configured to " 11 ", this can be indicated For complete Mode change when be limited to 6 seconds.

For example, Mode change position can be configured to " 10 " if Mode change time-consuming 3 seconds or less.Starting mode Before transformation, wireless power receiver 450 can be ensured with matching the power consumption of 1.1W in mode by changing input impedance setting Impedance variations will not occur during transformation.Therefore, wireless power transmitter 400 is set as wireless power receiver according to this 450 adjustment power ITX_COIL, and therefore power ITX_ can be maintained for wireless power receiver 450 during Mode change COIL。

Therefore, after the Mode change duration is by the setting of Mode change position, wireless power transmitter 400 can be in mode Power ITX_COIL is maintained for wireless power receiver 450 during transformation, for example, for 3 seconds.In other words, even if wireless function Rate transmitter 400 did not received response from wireless power receiver 450 during 3 seconds, and wireless power transmitter 400 can also maintain With the connection of wireless power receiver 450.However, wireless power transmitter 400 can after by the Mode change duration Terminate power to send, it is thus regarded that wireless power receiver 450 is illegal object.

Wireless power receiver 450 can sense the generation of mistake.In the step s 420, wireless power receiver 450 can incite somebody to action Caution signal is sent to wireless power transmitter 400.The caution signal can be used as PRU Dynamic Signal or alarm signal to send out It send.For example, the PRU alert field shown in table 1 above can be transmitted in wireless power receiver 450, with to wireless power transmission Device 400 indicates error condition.Alternatively, wireless power receiver 450 can send instruction mistake to wireless power transmitter 400 The independent caution signal of state.In step S422, when receiving caution signal, wireless power transmitter 400 can enter Latch fault mode.In step S423, wireless power receiver 450 can enter dummy status.

Fig. 5 is the wireless power transmitter of another embodiment according to the present invention and the method for wireless power receiver Flow chart.The control method in Fig. 5 is described in detail referring to Fig. 6.Fig. 6 is shown according to Fig. 5 by wireless power transmitter Figure of the amount of 400 power applied relative to time shaft.

Referring to Fig. 5, in step S501, wireless power transmitter 400 can bring into operation.In addition, wireless power transmitter 400 can reset initial setting in step S503 and can enter energy-saving mode in step S505.In energy-saving mode, Wireless power transmitter 400 can apply the different types of power with different capacity amount to power transmission unit.For example, scheming In 6, wireless power transmitter 400 can apply the second detection power 601 and 602 to power transmission unit and third detects power 611 to 615.Wireless power transmitter 400 can periodically apply the second detection power 601 and 602 with second round.When When the supply of wireless power transmitter 400 second detection power 601 and 602, the second detection power 601 and 602 sustainable second is held The continuous time.Wireless power transmitter 400 can periodically apply the detection power 611 to 615 of the third with the period 3.Work as nothing When linear heat generation rate transmitter 400 supplies third detection power 611 to 615, third detects the sustainable third of power 611 to 615 and continues Time.As shown in fig. 6, third detection power 611 to 615 can performance number having the same or different performance numbers.

After output third detection power 611, the exportable third inspection with equal-wattage amount of wireless power transmitter 400 Power scale 612.If the output of wireless power transmitter 400 has as described above, same amount of third detects power 612, the Three detection power 612, which can have, is enough to detect the smallest wireless power receiver 450 (for example, the wireless power receiver of classification 1 450) quantity of power.

On the other hand, after output third detection power 611, wireless power transmitter 400 is exportable to have different capacity The third of amount detects power 612.If wireless power transmitter 400 exports different amounts of third detection power as described above, that The corresponding quantity of power of third detection power can be enough to detect the wireless power receiver of classification 1 to classification 5.For example, third Detection power 611 can have the quantity of power for the wireless power receiver 450 for being enough to detect classification 5, and third detection power 612 can have There is a quantity of power for the wireless power receiver 450 for being enough to detect classification 3, and third detection power 613 can have and be enough to detect The quantity of power of the wireless power receiver 450 of classification 1.

Second detection power 601 and 602 can drive wireless power receiver 450.In addition, the second detection power 601 and 602 There can be the quantity of power of the controller and/or communication unit that are enough to drive wireless power receiver 450.

Wireless power transmitter 400 can apply respectively second with second round and period 3 to power transmission unit It detects power 601 and 602 and third detects power 611 to 615.If wireless power receiver 450 is placed on wireless power On transmitter 400, it can change from the impedance of the view of wireless power transmitter 400.Wireless power transmitter 400 can Detect the impedance variations during application second detects power 601 and 602 and third detection power 611 to 615.For example, nothing Linear heat generation rate transmitter 400 can detect the impedance variations during applying third detection power 615.Therefore, in the step S507 of Fig. 5 In, wireless power transmitter 400 can detect object.If not detecting object in step s 507, in step S505, nothing Linear heat generation rate transmitter 400 is positively retained in energy-saving mode, and under the energy-saving mode, wireless power transmitter 400 is periodically applied Add different types of power.

In step s 507, if wireless power transmitter 400 detects object due to impedance variations, in step Wireless power transmitter 400 can enter low-power mode in 509.At low power modes, wireless power transmitter 400, which applies, drives Dynamic power, the driving power, which has, to be enough to drive the controller of wireless power receiver 450 and the quantity of power of communication unit.Example Such as, in Fig. 6, wireless power transmitter 400 can apply driving power 620 to power transmission unit.Wireless power receiver 450 It can receive driving power 620 and using driving power 620 come drive control device and/or communication unit.Wireless power receiver 450 can be communicated using driving power 620 with wireless power transmitter 400 with scheduled communication plan.For example, wireless power Receiver 450 is transmittable and receives the required data of certification, and can access based on the data by wireless power transmitter 400 The wireless power network of management.However, if illegal object is placed rather than wireless power receiver 450, it will not Execute data transmission and reception.Therefore, in the step S511 of Fig. 5, whether wireless power transmitter 400 can determine the object It is illegal object.For example, if wireless power transmitter 400 fails to receive response from the object in the given time, that Wireless power transmitter 400 can determine that the object is illegal object.

If wireless power transmitter 400 determines that the object is illegal object in step S511, in step Wireless power transmitter 400 can enter latch fault mode in S513.On the contrary, if in step S511 wireless power transmitter 400 determine that the object is not illegal object, then wireless power transmitter 400 can proceed with access behaviour in step S519 Make.For example, in Fig. 6, wireless power transmitter 400 can periodically apply the first power 631 with the period 1 to 634.Wireless power transmitter 400 can detect the impedance variations during applying the first power 631 to 634.For example, Fig. 5's If removing illegal object in step S515, wireless power transmitter 400 can be detected impedance variations and therefore really It is fixed to have removed the illegal object.On the contrary, if not removing illegal object, wireless power transmitter in step S515 400 will not detect impedance variations, and therefore can determine and do not remove the illegal object.If not removing illegal object, that Wireless power transmitter 400 can notify user radio function by least one of execution point bright light or output warning sound Rate transmitter 400 is currently at error condition.Therefore, wireless power transmitter 400 may include for point bright light and/or output police Accuse the output unit of sound.

If it is determined that not removing illegal object in step S515, then the wireless power transmitter 400 in step S513 It can maintain latch fault mode.On the other hand, if having removed illegal object in step S515, the nothing in step S517 Linear heat generation rate transmitter 400 can reenter energy-saving mode.For example, wireless power transmitter 400 can apply the second function in Fig. 6 Rate 651 and 652 and third power 661 to 665.

As described above, if illegal object (rather than wireless power receiver 450) is placed on wireless power transmitter 400 On, then wireless power transmitter 400 can enter latch fault mode.In addition, wireless power transmitter 400 can be existed based on basis The power applied under latch fault mode and the impedance variations that generate determine whether to have removed illegal object.That is, In the embodiment shown in fig. 5 and fig., the condition into latch fault mode can be that there are illegal objects.In addition to existing Other than illegal object, wireless power transmitter 400 can have many other conditions into latch fault mode.For example, wireless Power transmitter 400 can be cross connected to the wireless power receiver 450 being placed in another wireless power transmitter.At this In the case of kind, wireless power transmitter 400 can also pass through latch fault mode.

When wireless power transmitter 400 is cross connected to wireless power receiver 450, wireless power transmitter 400 must Original state must be returned, and wireless power receiver 450 should be removed.Wireless power transmitter 400 can set following situations The fixed condition at into latch fault mode: it is placed on the wireless power receiver 450 in another wireless power transmitter Interconnection, that is, the wireless power receiver 450 being placed in another wireless power transmitter is accessed by wireless power transmission In the wireless power network that device 400 manages.The wireless power when wrong (such as, interconnection) occurs is described below with reference to Fig. 7 The operation of transmitter 400.

Fig. 7 is the flow chart of the method for the control wireless power transmitter of an embodiment according to the present invention.Fig. 7's Control method will be described in detail referring to Fig. 8.Fig. 8 is to show being supplied by wireless power transmitter 400 according to the flow chart of Fig. 7 Power figure of the amount relative to time shaft.

Referring to Fig. 7, in step s 701, wireless power transmitter 400 can bring into operation.In addition, the nothing in step S703 Linear heat generation rate transmitter 400 is resettable initially to be set and can enter energy-saving mode in step S705.In the energy-saving mode, Wireless power transmitter 400 can apply the different types of power with different capacity amount to power transmission unit.For example, scheming In 8, wireless power transmitter 400 can apply the second detection power 801 and 802 to power transmission unit and third detects power 811 to 815.Wireless power transmitter 400 can periodically apply the second detection power 801 and 802 with second round.When When wireless power transmitter 400 applies the second detection power 801 and 802, the second detection power 801 and 802 sustainable second is held The continuous time.Wireless power transmitter 400 can periodically apply the detection power 811 to 815 of the third with the period 3.Work as nothing When linear heat generation rate transmitter 400 applies third detection power 811 to 815, third detects the sustainable third of power 811 to 815 and continues Time.As shown in figure 8, third detection power 811 to 815 can performance number having the same or different performance numbers.

Second detection power 801 and 802 can drive wireless power receiver 450.In addition, the second detection power 801 and 802 There can be the quantity of power of the controller and/or communication unit that are enough to drive wireless power receiver 450.

Wireless power transmitter 400 can apply to wireless power receiver 450 is respectively provided with second round and period 3 Second detection power 801 and 802 and third detect power 811 to 815.If wireless power receiver 450 is placed on nothing On linear heat generation rate transmitter 400, it can change from the impedance of the view of wireless power transmitter 400.Wireless power transmission The impedance that device 400 can detect during application second detects power 801 and 802 and third detection power 811 to 815 becomes Change.For example, wireless power transmitter 400 can detect impedance variations during applying third detection power 815.Therefore, In the step S707 of Fig. 7, object is can be detected in wireless power transmitter 400.In step S707, if do not detected pair As, in step S705, wireless power transmitter 400 is positively retained in energy-saving mode, in the energy-saving mode, wireless power Transmitter 400 periodically applies different types of power.

In step S707, if wireless power transmitter 400 detects object due to impedance variations, in step Wireless power transmitter 400 can enter low-power mode in S709.In low-power mode, wireless power transmitter 400 applies Driving power, the driving power, which has, to be enough to drive the controller of wireless power receiver 450 and/or the power of communication unit Amount.For example, in fig. 8, wireless power transmitter 400 can apply driving power 820 to power transmission unit.Wireless power receives Device 450 can receive driving power 820 and using driving power 820 come drive control device and/or communication unit.Wireless power connects Receiving device 450 can be communicated using driving power 820 with wireless power transmitter 400 with scheduled communication plan.For example, wireless Power receiver 450 is transmittable and receives the required data of certification, and is accessed based on the data by wireless power transmitter The wireless power network of 400 management.

Then, in the step S711 of Fig. 7, wireless power transmitter 400 can ingoing power transfer mode, in the power In transfer mode, wireless power transmitter 400 sends charge power.For example, as shown in figure 8, wireless power transmitter 400 can be applied Add charge power 821 and charge power 821 can be transmitted to wireless power receiver 450.

In power transfer mode, wireless power transmitter 400 can be determined whether that mistake has occurred.The mistake can for There are illegal object, interconnection, overvoltage condition, overcurrent condition or overtemperature conditions in wireless power transmitter 400. Wireless power transmitter 400 may include the sensing unit for measuring overvoltage condition, overcurrent condition or overtemperature condition. For example, wireless power transmitter 400 can measure voltage or electric current at reference point, and it can determine the electricity of the measurement more than threshold value Pressure or electric current meet overvoltage condition or overcurrent condition.Alternatively, wireless power transmitter 400 may include temperature sensing Device, and the temperature sensor can measure the temperature at the reference point of wireless power transmitter 400.If the temperature at reference point Degree is more than threshold value, then wireless power transmitter 400, which can determine, meets overtemperature condition.

If wireless power transmitter 400 determines overvoltage, overcurrent or mistake according to the voltage, electric current or temperature value of measurement Hot state of temperature, the wireless power transmitter 400 prevent overvoltage, excessively electric by the way that wireless charging power is reduced predetermined value Stream or overtemperature.An embodiment according to the present invention, if the voltage value of reduced wireless charging power is lower than setting Minimum value is (for example, the minimum amount of voltage that V of the output in the rectifier of wireless power receiver 450_{RECT_MIN_DYN}), then Stop wireless charging and therefore can readjust voltage setting value.

Although in fig. 8, there are illegal objects to be shown as mistake in wireless power transmitter 400, and mistake is unlimited In there are illegal objects.Therefore, it will be appreciated by those of ordinary skill in the art that for there are illegal objects, interconnection, excessively electric Press strip part, overcurrent condition and overtemperature condition, wireless power transmitter 400 can be operated in a similar way.

In the step S713 of Fig. 7 if there is no mistake, in step S711, wireless power transmitter 400 can be tieed up Hold power transfer mode.On the other hand, in case of mistake in step S713, then wireless power is sent out in step S715 Emitter 400 can enter latch fault mode.For example, as shown in figure 8, wireless power transmitter 400 can apply the first power 831 to 835.In addition, during latch fault mode, the exportable error notification of wireless power transmitter 400, the error notification includes At least one of lamp illumination or warning sound.If it is determined that not removing illegal object or wireless function in the step S717 of Fig. 7 Rate receiver, then wireless power transmitter 400 can maintain latch fault mode in step S715.On the contrary, in step S717 In if it is determined that illegal object or wireless power receiver have been removed, then wireless power transmitter 400 can in step S719 Reenter energy-saving mode.For example, in fig. 8, wireless power transmitter 400 can apply the second power 851 and 852 and third Power 861 to 865.

Described above is the operations of wireless power transmitter 400 when occurring wrong during the transmission of charge power.Hereafter It describes when the multiple wireless power receivers 450 being placed in wireless power transmitter 400 are received from wireless power transmitter 400 The operation of wireless power transmitter 400 when charge power.

Fig. 9 is the flow chart of the method for the control wireless power transmitter 400 of an embodiment according to the present invention.Figure 9 control method is described in detail hereinafter with reference to Figure 10.Figure 10 is shown according to the flow chart of Fig. 9 by wireless power Figure of the amount for the power that transmitter 450 applies relative to time shaft.

Referring to Fig. 9, in step S901, charge power can be sent to the first wireless power by wireless power transmitter 400 Receiver 450.In addition, wireless power transmitter 400 can additionally allow for the second wireless power receiver to access in step S903 Wireless power network.In step S905, charge power also even can be sent to the second wireless function by wireless power transmitter 400 Rate receiver.In addition, wireless power transmitter 400 can be by charge power and second needed for the first wireless power receiver 450 The summation of charge power needed for wireless power receiver is applied to the first wireless power receiver 450 and the second wireless power connects Receive the power receiving unit of device.

Step S901 to S905 is shown in Figure 10.For example, wireless power transmitter 400 can maintain energy-saving mode, described In energy-saving mode, wireless power transmitter 400 apply second detection power 1001 and 1002 and third detect power 1011 to 1015.Then, wireless power transmitter 400 can detect the first wireless power receiver 450 and enter low-power mode, described In low-power mode, wireless power transmitter 400 maintains detection power 1020.Then, wireless power transmitter 400 can enter function Rate transfer mode, in the power transfer mode, wireless power transmitter 400 applies the first charge power 1030.Wireless function Rate transmitter 400 can detect the second wireless power receiver, and the second wireless power receiver is allowed to access wireless power Network.In addition, wireless power transmitter 400 can apply the second charge power 1040, second charge power 1040 is first The summation of charge power needed for charge power needed for wireless power receiver 450 and the second wireless power receiver.

Referring again to Fig. 9, when charge power is sent to the first wireless power receiver 450 and second in step S905 When both wireless power receivers, in step s 907, mistake is can be detected in wireless power transmitter 400.As described above, described Mistake can be that there are illegal object, interconnection, overvoltage condition, overcurrent condition or overtemperature conditions.In step S907- In N if there is no mistake, wireless power transmitter 400 can continue to the second charge power 1040.

On the other hand, in step s 907 in case of mistake, then wireless power transmitter 400 can in step S909 Into latch fault mode.For example, as shown in Figure 10, wireless power transmitter 400 can apply the first function with the period 1 Rate 1051 to 1055.Wireless power transmitter 400 can be determined whether that having removed the first wireless power connects in the step S911 of Fig. 9 Receive both device 450 and the second wireless power receiver.For example, wireless power transmitter 400, which can detect, is applying the first power Impedance variations when 1051 to 1055.Whether wireless power transmitter 400 can return to initial value by inspection impedance to determine Whether first wireless power receiver 450 and second wireless power receiver both have been removed.

If it is determined that having removed the first wireless power receiver 450 and the second wireless power receiver two in step S911 Person, then wireless power transmitter 400 can enter energy-saving mode in step S913.For example, as shown in Figure 10, wireless power hair Emitter 400 can apply the second detection power 1061 and 1062 for being respectively provided with second round and period 3 and third detection function Rate 1071 to 1075.

As described above, occurring even if wireless power transmitter 400 applies charge power to multiple wireless power receivers When mistake, wireless power transmitter 400 can easily determine whether removed wireless power receiver or illegal object.

Figure 11 be an embodiment according to the present invention wireless power transmitter under the SA mode and wireless function The block diagram of rate receiver.

Referring to Fig.1 1, wireless power transmitter 1100 may include communication unit 1110,1120 resonator 1130 of PA.Nothing Linear heat generation rate receiver 1150 may include 1151, application processor (AP) communication unit (or wireless power transmission (WPT) communication IC) 1152, power management integrated circuit (PMIC) 1153, wireless power integrated circuit (WPIC) 1154, resonator 1155, interface function Rate manages IC (IFPM) 1157, TA 1158 and battery 1159.

The communication unit 1110 of wireless power transmitter 1100, which can be realized, combines IC for WiFi/BT, and can be with predetermined Communication plan (for example, with BLE) communicated with the communication unit 1151 of wireless power receiver 1150.For example, wireless power connects PRU Dynamic Signal with foregoing data structure shown in table 1 above can be sent to by the communication unit 1151 for receiving device 1150 The communication unit 1110 of wireless power transmitter 1100.As described above, PRU Dynamic Signal may include wireless power receiver 1150 At least one of information of voltage, current information, temperature information and warning information.

The output power value from PA 1120 can be adjusted based on received PRU Dynamic Signal.For example, if overvoltage item Part, overcurrent condition or overtemperature condition are applied to wireless power receiver 1150, then can reduce from the output of PA 1120 Performance number.If the voltage or electric current of wireless power receiver 1150 are lower than predetermined value, can increase from the output of PA 1120 Performance number.

The charge power of resonator 1130 from wireless power transmitter 1100 can be wirelessly transmitted to wireless power reception The resonator 1155 of device 1150.

WPIC 1154 to from the received charge power of resonator 1155 can rectify and to rectified charge power Execute DC/DC conversion.WPIC 1154 can drive communication unit 1151 or be charged using converted power to battery 1159.

Wired charging terminal can be inserted into TA 1158.Wired charging terminal (such as, 30- pin connectors or general serial Bus (USB) connector) it can be inserted into TA 1158.TA 1158 can receive power from external power supply and utilize received power It charges to battery 1159.

IFPM 1157 can be handled from the received power of wired charging terminal and by the power output of processing to battery 1159 With PMIC 1153.

PMIC 1153 can manage wirelessly or non-wirelessly received power and each portion for being applied to wireless power receiver 1150 The power of part.AP 1152 can receive power information from PMIC 1153, and control communication unit 1151 and send for reporting function The PRU Dynamic Signal of rate information.

The node 1156 for being connected to WPIC 1154 can be connected to TA 1158.If there is line charge electric connector is inserted into TA In 1158, then predetermined voltage (for example, 5V) can be applied to node 1156.WPIC 1154 can be applied to node by monitoring 1156 voltage determines whether inserted with line charge Electric adapter.

AP 1152 has the storehouse of predetermined communication plan, for example, WiFi/BT/BLE storehouse.Therefore, for for wireless The communication unit 1151 communicated that charges can load the storehouse from AP 1152, and then based on the heap of WiFi/BT/BLE Stack to communicate with the communication unit 1110 of wireless power transmitter 1100.

However, by the pass of AP 1152 from the memory search data of AP 1152 and during using retrieved data State or underpower are to maintain the open state of AP 1152, it may occur however that can not retrieve from AP 1152 and send out for wireless power The data sent.

If the dump power amount of battery 1159 is lower than minimum power limit as described above, AP 1152 can be closed And some component wireless chargings for wireless charging in wireless power receiver 1150 can be used in battery 1159, such as logical Believe unit 1151,1154 resonator 1155 of WPIC.It can not apply and be enough to open the state of the power of AP 1152 and can be described as electricity Pond spent condition.

Because AP 1152 is unable to run under battery spent condition, communication unit 1151 will not receive predetermined communication The storehouse of scheme, such as the WiFi/BT/BLE storehouse from AP 1152.It anticipates such case, can be obtained from AP 1152 pre- Determine a part (for example, BLE storehouse) of the storehouse of communication plan and stores it in the memory 1162 of communication unit 1151. Therefore, communication unit 1151 can be used be stored in memory 1162 the communication plan for wireless charging storehouse (i.e. without Line charge protocol) to communicate with wireless power transmitter 1100.Communication unit 1151 can have internal storage.In SA mode In, BLE storehouse is storable in read-only memory (ROM).

As described above, communication unit 1151 is communicated using the storehouse for the communication plan being stored in memory 1162 Mode can be described as SA mode.Therefore, communication unit 1151 can be based on BLE stack management charging process.

An embodiment according to the present invention, if the battery 1159 of wireless power receiver 1150 is exhausted in battery State, or if lead to communication unit since AP 1152 cannot be operated under the off-position of wireless power receiver 1150 Member 1151 can not receive BLE storehouse from AP 1152, then wireless power receiver 1150 connects from wireless power transmitter 1100 Right of way signal will not be sent by communication unit 1151 in the given time later by receiving beacon signal.

For example, long beacon signal can be transmitted in wireless power transmitter 1100, and is receiving long letter according to A4WP standard When marking signal, right of way signal can be sent to wireless power transmitter 1100 in the given time by wireless power receiver 1150, To continue the registration process of wireless charging.

However, as described above, if necessary to start-up course to operate AP 1152, and wireless power receiver 1150 at this time The power of battery it is lower or exhaust or wireless power receiver 1150 power off, then wireless power receiver 1150 will not be pre- Right of way signal is sent to by wireless power transmitter 1100 by communication unit 1151 in fixing time.If wireless power receiver 1150 can not send right of way signal in this way in the given time, then normal registration process is not carried out, to make Wireless charging cannot be carried out to wireless power receiver 1150 by obtaining.

Describe following various embodiments now with reference to Figure 12 to Figure 17: extending the sending cycle of beacon signal so that Right of way signal can be received in the given time, and but regardless of time delay to which kind of degree, the time is to execute wireless function Time needed for sending right of way signal by communication unit 1150 after the AP 1152 of rate receiver 1150.

Referring to figs. 1 to Figure 11, wireless charging system according to the present invention is described above.Extremely below with regard to Figure 12 Figure 17 be described in detail an embodiment according to the present invention in wireless charging system by wireless power transmitter come The method and wireless power transmitter and wireless power receiver of transmission signal.

Figure 12 is the figure for showing the transmission of beacon signal of an embodiment according to the present invention.

Referring to Fig.1 2, wireless power transmitter (PTU) can periodically apply electric current I_{TX_LONG_BEACON}, in energy conservation Long beacon signal is sent to its PTU resonator in mode or power save mode.Wireless power transmitter can apply electric current I_{TX_LONG_BEACON}, to be used to send long beacon signal in 10ms, the short beacon signal terminating in 10ms.

For example, according to standard document, if wireless power transmitter sends the week of long beacon signal without departing from energy-saving mode Phase t_{LONG_BEACON}It can be 105ms ± 5ms.Period t_{LONG_BEACON}It can be shorter.For example, sending the period of long beacon signal t_{LONG_BEACON_PERIOD}It can be 850ms or longer, but be no more than 3 seconds.

When received while sending long beacon signal with the wireless power transmission related right of way signal of service, wireless function Rate transmitter may be switched to low-power mode or low power state, and send connection request in 0 to 50ms.Right of way signal The following conditions should be met:

The received signal strength indicator (RSSI) of right of way signal is greater than the ADV_PWR_MIN measured at receiving antenna；And And

Wireless power transmitter monitors the impedance variations about in notification time.

If being unsatisfactory for all these conditions, wireless power transmitter is negligible logical from wireless power receiver Accuse signal.If meeting one in these conditions and if for example receiving the 11st right of way signal or have already passed through It is more than 1700ms, then connection request can be transmitted in wireless power transmitter.

After connection request, wireless power transmitter can maintain power level to continue 500ms, to connect for wireless power Receive the registration of device.

If the power of battery of wireless power receiver exhausts or wireless power receiver is in battery spent condition, that Wireless power receiver will not send right of way signal in 110ms.If the wireless power supplied by wireless power transmitter Communication unit (for example, BLE chip of communication unit) can not be waken up in 110ms, then filling to wireless power receiver Electricity may be impossible.

Figure 13 is the figure for showing the transmission of beacon signal of an embodiment according to the present invention.

Referring to Fig.1 3, if the wireless power that wireless power receiver is not sent from wireless power transmitter is (for example, short Beacon signal or long beacon signal) it wakes up, then wireless power receiver must be received by the power of the battery supplied of its own.

In the case where the battery of wireless power receiver exhausts or wireless power receiver is in battery spent condition, If the period by wireless power transmitter provisioning wireless power is not long enough to charge the battery and wake up control Device (for example, MCU chip), then wireless power receiver will not send the right of way signal for entering low-power mode.

For example, the sending cycle of long beacon signal is only 105ms ± 5ms, this is for calling out according to wireless charging standard document Wake up wireless power receiver controller (for example, AP 1152 of Figure 11) and to wireless power transmitter send right of way signal For may be too short.

For this reason, long beacon sending cycle must be extended to enough periods and comes to electricity by wireless power receiver It charges and wakes up controller in pond.

Therefore, an embodiment according to the present invention, wireless power transmitter can long beacon sending cycle (for example, About 100ms) terminate to check load variation more than once before.In addition, an embodiment according to the present invention, wireless function Rate receiver can generate the load that can be detected by wireless power transmitter before long beacon sending cycle terminates to be changed.

In other words, before long beacon sending cycle terminates, wireless power receiver can produce load variation, and nothing Linear heat generation rate transmitter can detect the load variation and long beacon sending cycle extended additional long beacon sending cycle.According to One embodiment of the invention, when wireless power receiver generates load variation in long beacon sending cycle, wireless function Rate transmitter can continue to extend long beacon sending cycle.

Since wireless power transmitter can detect load variation before long beacon sending cycle terminates and send out long beacon Send cycle stretch-out another long beacon sending cycle, thus wireless power receiver can by periodically generate load variation come Maintain long beacon sending cycle.Periodically load variation can be generated by fictitious load or equivalent circuit.

Therefore, wireless power receiver can extend the sending cycle of long beacon signal, until the electricity of wireless power receiver Pond is electrically charged or wireless power receiver supplies enough power come until waking up controller.

In addition, an embodiment according to the present invention, since wireless power transmitter must save power, wireless power Transmitter, which can limit the extended number of the long beacon signal of wireless power receiver or wireless power transmitter, can extend length The sending time of beacon signal is only to predetermined time (for example, 7 seconds).Predetermined time can be set to be enough the reception of wake on wireless power The controller of device and the time that right of way signal is received from wireless power receiver.

Figure 14 is the flow chart for showing the beacon signal transmission process of an embodiment according to the present invention.

Referring to Fig.1 4, in energy-saving mode (step S1402), in step S1404, wireless power transmitter can be predetermined Short beacon signal or long beacon signal are sent during period in each predetermined period.It is in step S1406 if scheduled Long beacon sending cycle terminates, then can terminate the transmission of long beacon signal in step S1408, and reaches next hair Long beacon signal can be sent when sending the period again.

An embodiment according to the present invention, in step S1406 if the transmission of long beacon signal terminate before (or Person is during the transmission of long beacon signal) detect that the load of wireless power receiver changes in step S1410, then in step The predetermined sending cycle of long beacon signal can be extended in rapid S1412.

Figure 15 is the figure for showing the transmission of beacon signal of an embodiment according to the present invention.

Referring to Fig.1 5, in one embodiment of the invention, inband signaling can be used to request in wireless power receiver Extend the sending cycle of long beacon signal.

For example, as shown in figure 15, before long beacon sending cycle terminates, if wireless power transmitter is to inband signaling It carries out demodulation and predetermined code or signal is detected due to the demodulation, then wireless power transmitter can believe long beacon Number sending cycle extend predetermined period.

It can be by view of being enough the controller of power supply to wireless power receiver and being sent to right of way signal The time of wireless power transmitter extends the sending cycle of long beacon signal.

An embodiment according to the present invention, the long beacon sent in inband signaling extend request signal and can be configured At predetermined code or pulse signal.Therefore, wireless power transmitter can be checked by being analyzed inband signaling or being demodulated Predetermined code or pulse, so that long beacon signal sending cycle is extended predetermined period.

An embodiment according to the present invention, if wireless power receiver is desirable for inband signaling to send long letter Mark extends request signal, then wireless power receiver may include fictitious load or load modulation circuit.From wireless power transmission When device receives short beacon signal or long beacon signal, wireless power receiver can by switch be connected to fictitious load circuit or Person changes load by load modulation circuit to send information using inband signaling.

Wireless power transmitter may also include the circuit that can be demodulated to the load variation from inband signaling, and It can be detected by the way that inband signaling is demodulated and/or decoded and extend request signal including the long beacon in inband signaling.

Figure 16 is the flow chart of the beacon signal transmission process of an embodiment according to the present invention.Referring to Fig.1 6, In energy-saving mode (step S1602), in step S1604, wireless power transmitter can be during predetermined amount of time each pre- Short beacon signal or long beacon signal are sent in fixed cycle.If scheduled long beacon sending cycle terminates, can terminate to grow The transmission of beacon signal, and long beacon signal can be sent again when reaching next sending cycle.

Various embodiments according to the present invention, wireless power transmitter can be in long beacon signal in step S1606 Transmission demodulates inband signaling before (or during the transmission of long beacon signal) terminating.In step S1608, as Demodulation result, if in inband signaling including the code or signal for extending request signal corresponding to pre- fixed-length beacon, In step S1610, the predetermined sending cycle of long beacon signal can be extended predetermined period by wireless power transmitter.

Referring to Fig.1 7, wireless power receiver may include power receiving unit 1701, rectifier 1702, DC/DC converter 1703, control circuit 1704, load switch 1707 and load 1708.

Received AC electric current can be converted into DC electric current in rectifier 1702 at power receiving unit 1701.According to this hair A bright embodiment, control circuit 1704 can be driven by converted DC electric current, and producing can be by predetermined electricity The control signal of road control load switch 1707.

For example, being controlled if wireless power transmitter sends short beacon signal as described above or long beacon signal Circuit 1704 can be by being driven by 1701 received signal of power receiving unit.Thus, for example, control circuit 1704 can be by receiving Short beacon signal or long beacon signal driving, and before the transmission of long beacon signal terminates controllable load switch 1707, to generate load variation.Control circuit 1704 can be configured to independently of wireless power receiver controller it is only Vertical circuit, and can even be driven before driving by reception electric current in the controller (for example, AP) of wireless power receiver.

An embodiment according to the present invention, if wireless power receiver is before the transmission of long beacon signal terminates Load variation is generated in this way, then the hair that load changes and extends long beacon signal can be detected in wireless power transmitter Send the period.

An embodiment according to the present invention, control circuit 1704 are attached to power receiving unit 1701 and rectifier Between 1702, and receive AC electric current.Although in Figure 17 control circuit 1704 be shown as control the opening of load switch 1707/ It closes, but control circuit 1704 can be configured to switch over the connection of the provided fictitious load other than load 1708.

Above-mentioned load variation production method and circuit shown in Figure 17 can detect in equipment, the extension of long beacon, intersect It connects and is used in the various modes of prevention and detection, illegality equipment detection, in-band signaling etc..

Although having referred to certain embodiments of the present invention has shown and described the present invention, those skilled in the art should be managed Solution, can make the variation of various forms and details in the present invention, without departing from such as by appended claims it is equivalent with theirs Scope and spirit of the present invention defined by object.

Claims

1. a kind of wireless power transmitter by wireless charging system is come the method that sends signal, which comprises

The first beacon signal for continuing for the first duration is sent within each period 1；

The second beacon signal for continuing for the second duration is sent within each second round；

Detection load variation while sending second beacon signal；And

In response to the load variation of detection, by second duration extension to predetermined time, wherein the predetermined time is Sending, second beacon signal is predetermined.

2. the method as described in claim 1, wherein first beacon signal is short beacon signal and second beacon Signal is long beacon signal.

3. the method as described in claim 1 further includes receiving right of way signal from wireless power receiver.

4. the method as described in claim 1, wherein the predetermined time is less than or equal to 7 seconds.

5. the method as described in claim 1, further includes:

The inband signaling from wireless power receiver is decoded during sending second beacon signal；And

If decoded signal corresponds to predetermined value, the decoded signal is determined as the hair to second beacon signal The extension request signal sent.

6. a kind of wireless power transmitter, comprising:

Power transmission unit, be configured within each period 1 send continue the first duration the first beacon signal and The second beacon signal for continuing for the second duration is sent within each second round；

Sensing unit is configured to detection load variation while sending second beacon signal；And

Controller is configured to the load variation in response to detection, by second duration extension to predetermined time, wherein institute It is predetermined in transmission second beacon signal for stating the predetermined time.

7. wireless power transmitter as claimed in claim 6, wherein first beacon signal is short beacon signal and institute Stating the second beacon signal is long beacon signal.

8. wireless power transmitter as claimed in claim 6, wherein the controller is configured as from wireless power receiver Right of way signal is received, and handles and is registrated with the wireless power receiver.

9. wireless power transmitter as claimed in claim 6, wherein the predetermined time is less than or equal to 7 seconds.

10. wireless power transmitter as claimed in claim 6, further includes:

Decoding unit, be configured to during sending second beacon signal to the inband signaling from wireless power receiver into Row decoding；And

Wherein if decoded signal corresponds to predetermined value, the controller is further configured to the decoded signal is true It is set to the extension request signal of the transmission to second beacon signal.